my car starts but is missing (miss fire code) causing lose of power and rough idle

Asked by Nov 04, 2015 at 07:49 PM about the 2007 Pontiac Grand Prix Base

Question type: Maintenance & Repair

My car (07 grand prix) is missing on 2 cylinders thinks is 2 and 4 I replaced
coil pack but no change (old coil was still good) tested to the best of my ability
the ignition module and I'm getting power there and power to my crank
position sensor what else am i missing and why can't I find the cause of my
multi miss fire?

5 Answers


Did you also change the spark plugs? If the plugs are shot then changing the coils won't help.

spark plugs probably need changed yes but the coil pack itself is not firing replaced it still no fire on a new coil swapped my old coil out with one of the other coils and it fires


Mine did the same thing. Changed plugs and wires and wala' - fixed.

Coil has to be fireing before it warrants changing plugs


Not sure how you were testing your coil but I think you should still consider the plugs. Does this car also have ignition wires? They too could be the cause for misfires. Does the car have a single coil unit or one for each cylinder? Different techniques would be used to troubleshoot. What happened when you put the "old coil" back in? you said it worked but did the miss stop?

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 1,902 nationwide Grand Prix listings starting at $3,000.


Pontiac Grand Prix Experts

  • #1
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used Chevrolet Impala
371 Great Deals out of 27,339 listings starting at $1,499
Used Pontiac G8
4 Great Deals out of 348 listings starting at $4,900
Used Dodge Charger
247 Great Deals out of 33,171 listings starting at $495
Used Chevrolet Monte Carlo
950 listings starting at $3,786
Used Pontiac G6
27 Great Deals out of 2,893 listings starting at $699
Used Chevrolet Malibu
605 Great Deals out of 48,235 listings starting at $1,500
Used Pontiac Grand Am
760 listings
Used Pontiac GTO
3 Great Deals out of 374 listings starting at $3,950
Used Ford Mustang
287 Great Deals out of 38,472 listings starting at $1,995
Used Chrysler 300
296 Great Deals out of 19,079 listings starting at $1,999
Used Nissan Maxima
220 Great Deals out of 18,086 listings starting at $1,500
Used Buick LaCrosse
230 Great Deals out of 12,874 listings starting at $1,800

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.